“The event would not have been approved in Grand Canyon National Park,” park spokeswoman Maureen Oltrogge told Forbes on Sunday. “Events must not unreasonably impair the park’s atmosphere of peace and tranquility or have an unacceptable impact on the experience of park visitors.”

The 34-year-old Wallenda, a seventh-generation “flying Wallenda” daredevil, teetered his way across the 30-mph-wind-whipped Little Colorado Gorge in Little Colorado River Navajo Tribal Park, which lies in Navajo Nation land near Cameron, Ariz., says Forbes. The event, televised by Discovery Channel and NBC, brought the Navajo Nation the kind of attention its marketing budget can’t afford.

Erin Whittaker, a U.S. Marine turned park ranger, says the Grand Canyon is way more massive, and national park staff wouldn’t allow the tightrope stunt without more safety provisions.